CMOS detector with active amplifying transistors integrated in each pixel to decrease noise and improve signal output.

• A. Complimentary metal oxide sensor active pixel sensor (CMOS-APS)
• B. CMOS detector
• C. CCD
• D. PSP

Answer: (A)

Focus on per-pixel amplification in CMOS detectors. This option describes a CMOS active pixel sensor (CMOS-APS), where each pixel includes its own amplifying transistor. By amplifying the signal right at the pixel, electronic noise from the rest of the readout path is reduced and the signal-to-noise ratio improves. This leads to better image quality and higher dynamic range, which is particularly beneficial in dental radiography where low exposure levels are common and fast readout is desirable.

This differs from a generic CMOS detector, which may not specify per-pixel amplification. It also contrasts with a CCD, where charge is transferred through a readout register rather than being amplified at the pixel, and with PSP, which uses a storage phosphor plate that is read out optically rather than via per-pixel electronic amplification.